Radio tag antenna structure for an optical recording medium and a case for an optical recording medium with a radio tag antenna
US7248221B2 · kind B2 · utility
134Cited by
0References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 30, 2004 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Apr 28, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0407
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna comprises a dielectric member, an antenna pattern formed on one surface of the dielectric member, and a ground pattern formed on the other surface of the dielectric member. A part or the whole of the antenna is implanted in a dielectric layer on the side from which a laser beam does not come in of an optical recording medium symmetrically having a metal layer reflecting the laser beam and the dielectric layer, thereby to provide a radio tag antenna structure for an optical recording medium which is simple, is small-sized, and can secure necessary reading performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.